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radio cassette
radio compass
radio-controlled
radio frequency
radio galaxy
radio interferometer
radio jet
radio source
radio spectrum
radio star
radio telescope
radio wave
radioactive
radioactive dating
radioactive decay
radioactive series
radioactive tracer
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radioelement
ra·di·o·el·e·ment [ ràydee ō élləmənt ] (plural ra·di·o·el·e·ments)


noun 
Definition:
 
radioactive element: a chemical element that is radioactive
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